Hello, I Have IBS Both C And D At Times.

Hello, I have IBS both C and D at times. Should I take a supplement like Benefiber? I take Kefir every day at the advice of the NP at the Gasroentologists (sp?). I only move by bowels every 3 or 4 days and when I do, I am a unable to leave the house for over and hour. I also get gas pains and I wonder if it is caused by the Benefiber or Metamucil wafers. Have tried both before. Thanks for any advice you can offer. Joyce W.